The number of people served by advanced wastewater treatment plants doubled between 1968 and the mid-1990s, but because the treatment plants _______________________, the quantity of waste emitted into the water after treatment ___________________ .
A. became so much more effective; decreased by about one-third
B. became so much less effective; increased by about one-third
C. remained ineffective; remained the same
D. moderately improved; increased by 10%
A. became so much more effective; decreased by about one-third
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